Answer:
Step-by-step explanation:
(x^4 + 2x^3 - 7x - 9) +
(x^5 - 2x^4 + 8x + 18)
x^5 - x^4 + 2x^3 + x + 9
treatment iijiijiuej325ufffufuvufuuuuuuuuuuuuuu
1291.5km
12.3*105=1291.5km